Okay, my Tahoe is niether a Corvette or a Viper. Now I am sure we are all adults here and any gearhead knows that more flow is good whether you are talking about fuel, air, or exhaust, this also applies to everything from a go-cart to a formula-one racecar, and yes there are tons of aftermarket mods for Vettes and Vipers for people who race them, they tend to remove all smog equipment when they do that. My reason for wanting to remove my cat is simple, I don't really want to shell out the bucks they are wanting for one, they run from just under a hundred to almost three-hundred. My muffler is about to be replaced along with all of the pipes comming off the Cat, which I am thinking is due for replacement any time, and might already be partially clogged which is not that noticeable due to the fact I have big rust holes in the pipe leading to it. I dont know if any of this makes sense, but I am going to be out a couple hundred $$ on a Flowmaster, and new pipes throughout the length of my Tahoe as well as labor, I am only trying to keep from addind another couple hundred to it. I was looking at an 02 simulator on the net it is only like $25 I wonder if it works? It is supposed to keep high flow exhaust from throwing a check engine code, causing the ECM to maladjust the fuel air mixture, which is what I am wondering if I will run into. If anyone knows if there is an 02 sensor behind the cat., let me know.